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21
In . . . . . . . . the process of iron, iron is protected by a coating of zinc.
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Answer: Option C
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22
Which of the following alloys does not contain tin?
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Answer: Option A
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23
What is a galvanized iron?
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Answer: Option B
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24
Which of the following metal remains in liquid form at room temperature?
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Answer: Option B
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25
Baking powder is a mixture of . . . . . . . . and . . . . . . . .
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Answer: Option C
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26
Which of the following can be beaten into thin sheets?
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Answer: Option D
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27
The chemical name of blue vitriol is . . . . . . . .
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Answer: Option A
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28
Which of the following is a mineral required for the coagulation of blood?
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Answer: Option D
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29
. . . . . . . . is the process of making a thick oxide layer on aluminium
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Answer: Option A
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30
Which one of the following metals is liquid at room temperature?
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Answer: Option B
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